Tokio-quiche: lazily allocate H3 body_recv_buf#2546
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H3Driver eagerly allocated a 64 KiB body receive buffer per connection at construction. Make it Option<Limit<BytesMut>>, allocate it lazily on the first body read, and release it once no streams or flows remain, so idle connections hold no receive buffer.
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H3Driver eagerly allocated a 64 KiB body receive buffer per connection at construction. Make it Option<Limit>, allocate it lazily on the first body read, and release it once no streams or flows remain, so idle connections hold no receive buffer.